Which of the following correctly demonstrates the flow of energy through an ecosystem?

a and b

materials water oxygen those are the things i can think of in this moment.

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]